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Shock-induced thermal transformations of ries-biotites

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Abstract

Thermal transformations in biotites depending on increasing postshock temperatures were studied.

A decrease of the unit cell volume, caused by oxidation of octahedral Fe2+ to Fe3+ at temperature rangings of about 400–500° C was observed.

In the same temperature range (∼500° C) the biotite lattice becomes thermodynamically unstable. Intersheet and octahedral layers are decomposed, whereas individual SiO4-tetrahedra are more resistant to thermal vibrations. The decomposition of the biotite leads to the formation of new minerals and amorphous phases. By X-ray analysesmagnetite, hercynite, pyroxene, feldspar, and quartz were identified.

Thermal transformations of biotite induced by shock waves are characterized by states of distinct disequilibrium.

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Schneider, H. Shock-induced thermal transformations of ries-biotites. Contr. Mineral. and Petrol. 43, 233–243 (1974). https://doi.org/10.1007/BF01134839

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Keywords

  • Oxidation
  • Quartz
  • Shock Wave
  • Mineral Resource
  • Cell Volume